Managing cache backup and restore
View Patent ↗A method is used for managing cache backup and restore. I/O operations are quiesced at a cache module. A first snapshot of a storage object and a second snapshot of an SSD cache object are taken. The I/O operations at the cache module are unquiesced. A single backup image comprising the first snapshot and the second snapshot is created.
1. A method for use in managing cache backup and restore, the method comprising:
quiescing I/O operations at a cache module;
taking a first snapshot of a storage object and a second snapshot of an SSD cache object, wherein the SSD cache object includes dirty data;
unquiescing I/O operations at the cache module; and
creating a single backup image comprising the first snapshot and the second snapshot, wherein the single backup image includes a backup header, one or more storage object data blocks, a dirty region logging (DRL) metadata block, and a cache superblock, and wherein a memory area occupied by the single backup image is determined by the equation:
backup image size=sizeof(storage object)+(2*backupheadersize)+sizeof(superblock, DRL metadata blocks).
2. The method of claim 1 , further comprising:
reading data from the single backup image; and
restoring the storage object and SSD cache object from the single backup image.
3. The method of claim 2 , further including mapping restored storage objects and SSD cache object.
4. The method of claim 1 , wherein the first and second snapshots are point in time snapshots.
5. The method of claim 1 , wherein the storage object includes at least one of a file, block, or logical unit (LU).
6. The method of claim 1 , wherein quiescing I/O operations at the cache module includes redirecting I/O to the storage object.
7. A system for use in managing cache backup and restore, the system comprising:
first logic configured to quiesce I/O operations at a cache module;
second logic configured to take a first snapshot of a storage object and a second snapshot of an SSD cache object;
third logic configured to unquiesce I/O operations at the cache module; and
fourth logic configured to create a single backup image comprising the first snapshot and the second snapshot, wherein the single backup image includes a backup header, one or more storage object data blocks, a dirty region logging (DRL) metadata block, and a cache superblock, and wherein a memory area occupied by the single backup image is determined by the equation:
backup image size=sizeof(storage object)+(2*backupheadersize)+sizeof(superblock, DRL metadata blocks).
8. The system of claim 7 , further comprising:
fifth logic configured to read data from the single backup image; and
sixth logic configured to restore the storage object and the SSD cache object from the single backup image.
9. The system of claim 8 , further including mapping restored storage objects and SSD cache object.
10. The system of claim 7 , wherein the first and second snapshots are point in time snapshots.
11. The system of claim 7 , wherein the storage object includes at least one of a file, block, or logical unit (LU).
12. The system of claim 7 , wherein quiescing I/O operations at the cache module includes redirecting I/O to the storage object.
13. A computer program product for use in managing cache backup and restore comprising:
a non-transitory computer readable medium encoded with computer executable program code, the code configured to enable the execution of:
quiescing I/O operations at a cache module;
taking a first snapshot of a storage object and a second snapshot of an SSD cache object wherein the SSD cache object includes dirty data;
unquiescing I/O operations at the cache module; and
creating a single backup image comprising the first snapshot and the second snapshot, wherein the single backup image includes a backup header, one or more storage object data blocks, a dirty region logging (DRL) metadata block, and a cache superblock, and wherein a memory area occupied by the single backup image is determined by the equation:
backup image size=sizeof(storage object)+(2*backupheadersize)+sizeof(superblock, DRL metadata blocks).
14. The computer program product of claim 13 , the code further configured to enable the execution of:
reading data from the single backup image; and
restoring the storage object and SSD cache object from the single backup image.
15. A method for use in managing cache backup and restore, the method comprising:
quiescing I/O operations at a cache module;
taking a first snapshot of a storage object and a second snapshot of an SSD cache object, wherein the SSD cache object includes dirty data;
unquiescing I/O operations at the cache module; and
creating a single backup image comprising the first snapshot and the second snapshot, wherein a memory area occupied by the single backup image is determined by the equation:
backup image size=sizeof(storage object)+(2*backupheadersize)+sizeof(SSD dirty blocks)+sizeof(superblock, DRL metadata blocks).
16. A system for use in managing cache backup and restore, the system comprising:
first logic configured to quiesce I/O operations at a cache module;
second logic configured to take a first snapshot of a storage object and a second snapshot of an SSD cache object;
third logic configured to unquiesce I/O operations at the cache module; and
fourth logic configured to create a single backup image comprising the first snapshot and the second snapshot, wherein a memory area occupied by the single backup image is determined by the equation:
backup image size=sizeof(storage object)+(2*backupheadersize)+sizeof(SSD dirty blocks)+sizeof(superblock, DRL metadata blocks).
17. A computer program product for use in managing cache backup and restore comprising:
a non-transitory computer readable medium encoded with computer executable program code, the code configured to enable the execution of:
quiescing I/O operations at a cache module;
taking a first snapshot of a storage object and a second snapshot of an SSD cache object wherein the SSD cache object includes dirty data;
unquiescing I/O operations at the cache module; and
creating a single backup image comprising the first snapshot and the second snapshot, wherein a memory area occupied by the single backup image is determined by the equation:
backup image size=sizeof(storage object)+(2*backupheadersize)+sizeof(superblock, DRL metadata blocks).